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  1. #include <iostream>
  2. using namespace std;
  3. int main() {
  4.     int N;
  5.     cin >> N;
  6.     int nr;
  7.     cin >> nr;
  8.     int i = 1, mountain = 1, ascendent = 0, descendent = 0, ascendent2 = 0;
  9.     while (i < N) {
  10.         int new_nr;
  11.         cin >> new_nr;
  12.         if (new_nr == nr) {
  13.             mountain = 0;
  14.         }
  15.         if (new_nr > nr && descendent == 0) {
  16.             nr = new_nr;
  17.             ++ascendent;
  18.         }
  19.         if (new_nr < nr && descendent == 0) {
  20.             nr = new_nr;
  21.             ++descendent;
  22.         }
  23.         if (new_nr > nr && descendent != 0) {
  24.             ++ascendent2;
  25.         }
  26.         if (new_nr < nr && descendent != 0) {
  27.             nr = new_nr;
  28.             ++descendent;
  29.         }
  30.         ++i;
  31.     }
  32.     if (mountain == 0 || ascendent2 != 0 || descendent == 0 || ascendent == 0) {
  33.         cout << 0;
  34.     } else {
  35.         cout << 1;
  36.     }
  37.     return 0;
  38. }
Success #stdin #stdout 0s 5348KB
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https://ideone.com/baq3CQ
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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